Seasonal · USDA zones

The greenhouse grow calendar.

Month-by-month planning with approximate zone-based example dates, not local frost forecasts. Confirm dates for your location before sowing or moving plants outside. Gear links are sponsored and always marked.

Last frost (example) · zone 3

May 15

First frost (example) · zone 3

Sep 15

USDA hardiness zone

N. Minnesota, ND · illustrative dates only; hardiness zones do not determine exact frost dates

01 Jan

Jan

Start onions & leeks under lights

Shop Heat mat + LED

02 Feb

Feb

Sow tomatoes, peppers, eggplant

Shop Propagator

03 Mar

Mar

Prick out seedlings, add airflow

Open Inline fan

04 Apr

Apr

Harden off, plant hardy crops

Open Shade cloth

05 May

May

Transplant after your last frost

Shop Grow bags

06 Jun

Jun

Feed, water & manage the heat

Shop Auto vent opener

07 Jul

Jul

Pinch, train and shade at noon

Shop Misting kit

08 Aug

Aug

Sow autumn salads & brassicas

Shop Seed trays

09 Sep

Sep

Sow winter salads, harvest storage crops

Shop Frost cloth

10 Oct

Oct

Clean beds, insulate the north wall

Shop Bubble wrap insulation

11 Nov

Nov

Test heaters before first frost

Open Thermostat controller

12 Dec

Dec

Plan next season, order seeds

Shop Grow lights

Scroll sideways · sponsored links are marked

These example dates are not local frost predictions. Check your local extension service before planting outside; USDA hardiness zones describe winter minimum temperatures, not frost dates.